Board Thread:General Discussion/@comment-31518705-20170602194307/@comment-31267872-20170730160457

(Reply to Tristy639: There are other Pokémon too that can learn a move and only they can learn that move! Chatot is an example, though!)

Reply to Esha258: Wild guess... Bruxish? (Probably not, yes, sorry.)

This Pokémon is the first Pokémon in the only Legendary evolutionary line. (I think you know what first Pokémon in an evolutionary line is.)